Blowpipe



Sept. 13, 1938. J. H. BucKNAM BLOWPIPE Filed March 3l, 1954 INVENToR 1HBU C KNAM i FJ Tij-l? ATTORNEY Y Puendscpi. 13, 193s' UNITED STATESalzati:

nnowrrrrs' James Il. Bucknam, Cranford, N. J., assigner, by mesneassignments, to Union Carbide and CarbonCorporation, a corporation oiNew York Application March 3l, 1934, Serial No. 718,474

`7 Claims.

This invention relates to multiple iiame blowpipe nozzles and hasspecial utility in the art of machine welding o r other heatingprocesses wherein either the .nozzlejor the work is operated by amechanism, but it will be understood that the principles of my inventionmay be utilized in other types of blowpipes.

Heretofore, the dischargeoriilces of the mixture gas passages in weldingmachine blowpipe nozzles have been formed either directly in the nozzleblock or in burner tips connected by screw threads to the block. Whenthe orices oi the passages are formed directly in the nozzle block,

. the passages can be closely grouped and thereby increase the intensityof the heat over the area covered by all of-the nozzle names, but it isdifilcult to form passages in -the block having a larger. inlet thandischarge orifice which is del sirable in such passages in order toimprove the backfire resistance ofthe nozzle and the shape of the llamesfor maximum heating ability. Also, when the discharge orices are formedin the nozzle block and the ori-iices are enlarged, by burning, orcleaning the orices, they cannot be easily repaired orf renewed withoutchanging the welding characteristics ofthe nozzle.

When the oriflces of the passages are formed in tips which are screwthreaded to the nozzle block, the tip may ybe replaced in the event theoriilces should become damaged by burning or other incidents of'use, but'due to the space required for threads in the blocks and the extrathickness of tip wall for the threads on the tips, they cannot beclosely grouped to produce the desired intensity of -heat over the area'covered by all oi" the nozzle-llames. l

Therefore, among the' objects of the invention described vherein is toimprove the structure fof multiple flame -nozzles wherebyA the ilamesmay be closely grouped and the flame forming passa `es may be quicklychanged for ,like or unlike kin s to retain or change the weldingcharacteristics\ of the nozzle without altering the nozzle block.

Other objectsland' novel features of this invention will be more clearlyunderstood from -thefollowing description and accompanying drawing, .inwhich:

Fig. I is an end .view of a blowpipe nozzle and 'Flg. 1I is a sectionalview on line II--II of Fig. I illustratingan embodiment of theinvention; Fig. 'III is an enlarged lengthwise sectional lview of one ot.the blowpipe tips shown in Figs. I and II.

Figs. IV and V are lengthwise cross-sections of modiilcations ofdiiIerent types of vtips that may be employed -in the nozzle block,

` is gas tight. Assuming a shank 5 having a certain lgather than thethreaded vconnection by twice the (ci. lass-27.4)

In accordance with this invention the gas passage discharge oriflces Iare formed in tips 2 removably secured in smooth sockets 3 in a nozzleblock 4 so that the discharge orifices are arranged close to one anotherin rows, curved lines, or other configurations which may be suitable forwelding or other heating process, such as ilre nishing glass edges,where'a concentration of small flames is desirable.

As shown in the drawinmthe tips 2 81 arranged in a single row and aremade of relatively thin walled highly conductive metal, such as copper.The shank 5 of the tips v Z'received by the sockets l in the block l areslightly taperedtoward their upper ends. 'I'he sockets 3 inthe block 4are preferably similarly taperedfand are reamed to receive the shanks 5with a driving fit. The connection between the tip shank 5 and theVsocket 3 in the block I made in this manner wall thickness and having agas passage S of a certain diameter, the driving ilt connection ascompared to a threaded connection between thev shank 5 and the socket 3in the block reduces thel diameter of the socket measured from the rootof any thread that may be used by two times the depth ofthe thread.Consequently, the driving iit connection permits the centers of the gaspassages 5 in the tips 2 to be arranged closer todepth of the threadsthat have been heretofore used withoutweakening the walls of the sockets2 or the walls of the Shanks 5 by the loss of metal beween the rims ofthe sockets or reduction in the wall thickness of the tip shanks 5.

Furthermore, any tip 2 ymay be easily removed with a pair of pliers andreplaced by a new one which may be driven in with a wooden mallet or thelike. v As shown in Fig; III, the inlet 1 to the gas passage 6 in thetip 2 is larger than' the discharge orifice I. 'Ihe tip 2 being madeseparate from the block 4, the enlarged inlet. I maybe drilled from thevinlet end, and the passage may `be tapered toward the dischsrge'orificeI which is formed at the end of a small bore d connected to y the small'end ol.' the tapered passage 9. g v

'I'he blowpipe shown in Figs. I and 1I is espe#- ciaiiy adaptedforcontinuouslyweldlng straightv .line seams. -The tips 2 are arranged in astraight '50 are indicated by the-arrow A shown in Fig. II. j:

The preheating tips H, beginning from the end opposite to the head ofthe arrow A, progressively heat the edges of the seam until the edgesare melted by the welding tips W nearest the head of the'arrow A. Theprotecting tip P is rearwardly inclined in the direction of the arrow Aand isadapted toproduce a flame having a low heating effect and allowthe molten metal to cool thereunder while it is being protected therebyfrom the atmosphere.,

A combustible gas mixture is supplied to the preheating `and weldingtips H, W, through va. conduit I0 connected to a block II having a dis`tributing chamber I2 therein which is provided with individual -tubes Illeading therefrom to each of the tip sockets 3' in the nozzle block 4for conducting gas to the preheating and welding tips H, W. The tubesIl' thus provide independent means connecting the inner ends of each ofthe gas passages or tip sockets 3 with the distributing chamber I2 whichconstitutes a source of gas supply. v f

Since a different heating. characteristic is desired for the protectivetip P, it is supplied with a separate combustible mixture from aseparate mixer I4. The mixer I4 is supplied with acombustion-supportinggas through a pipe I5 and with a combustible gas `tllimugh apipe I I,each of the pipes being connected`with the mixer and a source of gas. l

'I'he individual gas tubes I3l leading to the preheating and weldingtips H,.W and the tubes I5 by a water jacket I1. The frontportion Il ofthe and having its lowerv end fitted to the nozzle block and I8 leadingto the mixer I,4 are surrounded jacket I'I extending above the nozzleblock 4 is preferably made ofpressed vsheet metal divided in halv alongthe line II-II of Fig. I, and silver soldered together around thenozzleblock 4, the mixer block 'I4 and thegas distributor block II. The rearportion of the jacket I1 which surrounds the tubes I5, I6 leading to themixer- I4 is an elliptical tube I9 slipped over the tubes I5, I5

4, the other portion I8 .of the jacket I1 and around the mixer block I4and silver soldered to these parts to provide a leakproof joint. 'Iheupper end of the elliptical jacket tube I9 is silver soldered to a blockto which the upper ends of the mixer tubes I5, I6 are connected. 4 Awater inlet 2l is provided in the forward portion I l of the waterJacket I1 and an outlet 22 is provided in the rear elliptical tube I8.'Ihe cooling nuid circulates about the tubes I2, and over the top.

surface of the nozzle block 4 and around y the mixer I4 as it passesupwardly through the elliptical tube I9 to the discharge outlet 22. Thecirculaticn of the cooling uid in contact v vith the members throughwhich the gas ilows emciently cools the combustible mixture for thepurpose of preventing flashbacks 1 A further concentration' of smallflames may be obtained 'by forming a plurality of.divergent e llameforming passages 24 in the same tip 25, as shown in Fig. IV.- Thepassages -24 are connected to a larger passage 25 in the tip 25 which issupplied with e combustible mixture er ses;

liig. V. 'Ihe name forming passage or passages 29 may be formed asdesired,'and supplied with' a combustible gas as' previously described.

, The blowpipe nozzle shown herein illustrates several ferme er thisinvention, and .it win be 4,understood that changes in the details vasshown may be made without departing from the scope of the invention asdeilned in the appended claims. Certain features disclosed but not'claimed herein form the subject matter of the copending `applications ofF. C. Geibig, Serial No. 726,216 and J. H. Bucknam, Serial No. 728,133.

I claim: 1. 'A blowpipe nozzle comprising a nozzle block havingaplurality of passages extending therethrough, each spaced from theother-by a relatively small distance and being connected with i a sourceof gas; and removable burner tips having Shanks, said Shanks beinglongitudinally slidably fitted in said passages, and said tips beingspaced closely enough to one another to pro- Jduce a substantiallycontinuous llame.

by means of a driving iit between said shank andv the tapered wall ofsaid passages, said tips being spaced closely enough to onel another toproduce a substantially continuous flame.

3.' A blowpipe nozzle comprising a nozzle block havinggas outlet means;a gas mixer block secured to said nozzle block and having gas outletmeans tubes severally supplying gas to said blocks; a cooling fluidjacketsecured to said nozzle block and 'surrounding said mixer block andsaid tubes; and means for conducting cooling fluid into said jacket anddischarging the cooling fluid from said jacket and circulating thecooling iluid in contact with said nozzle block and about said mixerblock and said tubes.

4. A blowpipe-comprising a nozzle block having 4a. plurality of gaspassages therethrough; outlet tips severally secured in the respectivepassagesA of said block solely by the fr ictional inter-engagement ofportions of the tips-.with portions of said passages; and means fordelivering gas from a single source ofcombustible gas to each of saidpassages individually, said tips and the corresponding passages in saidblocks beingsubstantially parallel and close enough together to producea substantially continuous elongated heating llame...

. 5. A blcwmpe nozzle comprising a nozzle block culating cooling fluidin contact with said nozzlev block and about said mixer block and saidtubes.

` 6. A multiple llame welding blowpipe comprising anozzle .blockvhavinga series of closelyadjoining substantially parallel gas passagesextending therethrough and individuny termineting in the top and bottomfaces of said block, the

bcttomend. of leach passage terminating in an inwardly tapered sockethaving a smoothsurface; a plurality of closelyadjoining-gas supply tubesindividually connected to and communicating with the top ends ot saidpassages; and apiurality ofclosely-adjoining burner tips individuallysecured'in the sockets in the bottomv ends of said 10 7. A multi-namewelding blowpipe comprising a nozzle block having a. plurality of gaspassages therethrough; individual tubes connected to the entrances ofsaid passages and to a gas supply source, the exits of said passagesbeing spaced closely enough to one another to produce a substantiallycontinuous iiame; and a plurality of burner tips respectively secured inthe exits of said passages by a driving fit, whereby minimum spacing ofsaid exits may be accomplished.

JAMES H. BUCKNAM,v 10

